formula for calculate vCpu

i use windows 2012 R2

and enable Hyper-V Role

and i want how to calculate vCPU formula ?

1. socket x core
2. socket x core x threads
3. socket x core x 2
4. socket x core x threads x 2
5. socket x core x 8
6. socket x core x threads x 8

ิbest regards

chatchai-netd